In a message sent to students and staff, university officials said the suspect is an undergraduate student. Baltimore police identified the suspect as Advaith Baimeedi, 19.

University officials said someone called to say that an unspecified lecture hall on the north Baltimore campus would be targeted.

The threat was unfounded, but it pushed final exams back by an hour.

The cellphone that was used to call in the threats was reported stolen from another student earlier in the day, police said.

Baltimore police and Johns Hopkins University security used surveillance cameras on campus and said they saw the suspect take the phone from a desk in the library. Detectives found the phone in bushes outside the Baltimore Museum of Art adjacent to the parking area.

Police said the suspect committed the act on a dare.

Baimeedi is charged with making a bomb threat, theft, false statement, threat of mass violence, arson and phone misuse.